SAN JOSE, Calif. – Few are more excited about Lego’s new Mindstorms sets rolling out next month than Silicon Valley engineers.

Many of them were drawn to the tech sector by the flagship kits that came on the market in 1998, introducing computerized movement to the traditional snap-together toy blocks and allowing the young innovators to build their first robots. Now, 15 years later, those robot geeks are entrepreneurs and designers, and the colorful plastic bricks have an outsized influence in their lives.

Techies tinker at Lego play stations in workplaces. Engineers mentor competitive Lego League teams. Designers use them to mock up larger project ideas. And executives stand Lego creations on their desks alongside family photos.

“Everyone I work with played with them as children. We sit around talking Lego. It’s a shared common experience,” said Travis Schuh, who reaches into his bin of plastic blocks when he needs a quick prototype at the Silicon Valley medical robotic firm where he works.

The new Mindstorms sets, on sale Sept. 1, are simpler for the younger crowd and more versatile for sophisticated users than two earlier versions.

The sets are designed for kids over 10 and make it easy to build basic, remote-controlled robots, including a cobra-like snake that snaps Lego brick fangs. Some shoot balls, others drive along color-coded lines.

But for $349, far more expensive than typical building toys, customers get a much more complex and powerful system.

“There’s actually a lot of engineering that goes into Lego bricks and the systems you can prototype out of them are pretty sophisticated,” says Stanford University engineering professor Christian Gerdes, who uses them in his classroom.

Professional hackers will also find plenty to do with the new Mindstorms, as the open source software uses Linux for the first time, and controller apps are integrated for tablets and mobile phones.

San Francisco-based software engineer Will Gorman is one of those adult users. He has torn apart Mindstorms kits to create a Lego toilet flusher, a Wii-playing robot that bowled a perfect game and a Lego Mars Curiosity Rover.

“I don’t consider myself an adult really,” said the 36-year-old father of two last week, setting up yet another creation on a table in a sunny Redwood City library overlooking San Francisco’s bay wetlands.

Denmark-based Lego first sold its plastic bricks 55 years ago, and watched them grow into one of the world’s most popular toys. But company officials say Mindstorms, designed for children but quickly snapped up by adults, changed their market.

“In the last 15 years, we have worked hard to balance the needs and wants of this shadow market while at the same time engaging kids,” said Michael McNally, a brand director at LEGO Systems Inc.

Many Bay Area engineers grew up competing in the First Lego League, which also launched in 1998 with 200 teams. Since then the league has expanded – last year more than 280,000 children around the world, ages 6-18, participated.

“We have a culture that only celebrates superheros in the worlds of entertainment and sports. We need to create superheros in the world of innovation,” said Dean Kamen, who founded FIRST (For Inspiration and Recognition of Science and Technology), which includes the First Lego League.

Nagy Hakim first played with Mindstorms at a robotics summer camp when he was in sixth grade. Since then, the college-bound 18-year-old from Santa Clara, Calif., has joined – and even mentored – Lego leagues.

Is this something he’s going to grow out of?

“Time will tell,” laughs Hakim. This fall he heads to Olin College of Engineering in Boston, where professors posit theoretical Lego problems, students are encouraged to mentor Lego teams and the library stocks Mindstorms kits.